/Engine/Plugins/Runtime/GeometryProcessing/Source/DynamicMesh/Public/MeshConstraintsUtil.h
For all edges, disable flip/split/collapse. For all vertices, pin in current position.
template<typename EnumerableType> static void FullyConstrainEdges ( [FMeshConstraints](API\Plugins\DynamicMesh\FMeshConstraints) & Constraints, const [FDynamicMesh3](API\Runtime\GeometryCore\DynamicMesh\FDynamicMesh3) & Mesh, EnumerableType Enumerable )